許家華博士

美國科羅拉多大學博爾德分校

摘要：
NOx and NMVOCs are major air pollutants originating from both anthropogenic and biogenic sources. They are also key precursors to the formation of fine PM2.5and O₃ air pollution. Exposure to air pollution not only threatens human health but also damages Earth’s ecosystems. Thus, it is crucial to understand and quantify their diverse emission sources to develop effective mitigation strategies.

This study used the TEMPO/TROPOMI NO₂ and HCHO data to constrain U.S. NOx and NMVOCs emissions and evaluate the performance of the emission inversion using ground-based and aircraft in-situ measurements. Top-down NOx emissions derived by assimilating midday TEMPO and TROPOMI can mitigate NOx overprediction. The NOx emissions optimization also showed positive impacts on ozone forecasts, especially when assimilating midday TEMPO data. This study suggested that TEMPO midday observations provide better constraints on anthropogenic NOx emissions than TROPOMI, while early morning TEMPO v3 data may be subject to large inaccuracies.

Preliminary results of NMVOC emissions inversion show that the top-down NMVOC emissions are lower than a priori when assimilating TEMPO and TROPOMI HCHO data. The posterior simulation improves the model-simulated isoprene mixing ratios over the southeastern U.S. and urban environments, indicating that the biogenic isoprene and many anthropogenic VOC emissions are well-constrained. However, some posterior VOC mixing ratios (e.g., benzene) remained biased high or low in urban areas and require further investigation.

演講語言：中文

邀請人: 陳毅軒老師